Manufacture of silk-like threads.



To all whom it may concern;

. these threads on leaving suitable for converting UNITED STATES PATENT OFFICE.

' RUDOLF LINKMEYER, 'oF BRUSSELS, BELGIUM.

' MANUFACTURE IOF-CSILK-LIKE THREADS.

alkalies is avoided and their strength increased, and the subsequent elimination of the 09 per that they still contain is facilitated y eliminating the free ammonia of I thepreci itation bath by the action of air before su jecting them to washing by dilute acids. 7

Instead of air, steam may be used or gases the oxid of copper into carbonate such as carbonic acid but it has been found that the best results are obtained by employing, for the elimination of the ammonia, solutions of salts that absorb ammonia and are capable of forming at the same time withthe oxid of copper contained in the threads, in acids, bonate ofsoda or combinations readily soluble potash, chromates, phosptlllates, oxalates, borates, iodids and so on.

steam or gases,

he same way as in treatment by air or the threads, on leaving the precipitation bath may be wound upon a perorated cylinder arranged in such a manner as to permit of filtration from the outside to the inside and vice-versa of solutions adapted to form with the oxid of copper combina- Q Specification of Letters Patent. 3 Application filed M31011 22, 1906. Serial NO- 307,405-

threads obtained by cu ro-ammoniacal.

such for example as solutions of car-- Patented June 25, 1907.-

tions which are readily soluble Y in acids but insoluble in water and at the same time capable of eliminating the ammonia, 4 What I claim as my invention and desire to secure by Letters Patent is:

1. In the manufacture of silk like threads by preci itation of cellulose in alkaline solutlons, su jecting'the threads, on leaving the precipitation bath, tothe action of an ammoma absorber suitable for forming with the oxid of copper in the threadscombinations readily solu le in acids but insoluble in water, and subsequently washing the threads with diluted aclds.

2, In the manufacture of silk like threads by precipitation of cellulose in alkaline solutions, su jecting the threads, on leaving the precipitation bath, by Winding said threads to permit of filtration from the outside to the inside and vice versa, to the action of an ammonia absorbent and at the same time forming, with the oxid of copper contained in the threads, combinations readily soluble in acids but insoluble in water, and subsequently washing the threads with diluted acids. I

I 3. In the manufacture 'of' silk like threads by precipitation of cellulose in alkaline solutions, treating) precipitation ath with a solution of carbothe threads, on leaving the nate of soda, and subse uently washing the threads withxdiluted'aci s.

In testimony whereof I have afiixed my signature in presence of two subscribing witnesses; ,V RUDOLF- LINKMEYER.

Witnesses:

H; J. E, KraKrATmoK, 'A. I. 'VOGEL. 

